drivers/infiniband/core/uverbs_main.c

   1 /*
   2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
   6  * Copyright (c) 2005 PathScale, Inc. All rights reserved.
   7  *
   8  * This software is available to you under a choice of one of two
   9  * licenses.  You may choose to be licensed under the terms of the GNU
  10  * General Public License (GPL) Version 2, available from the file
  11  * COPYING in the main directory of this source tree, or the
  12  * OpenIB.org BSD license below:
  13  *
  14  *     Redistribution and use in source and binary forms, with or
  15  *     without modification, are permitted provided that the following
  16  *     conditions are met:
  17  *
  18  *      - Redistributions of source code must retain the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer.
  21  *
  22  *      - Redistributions in binary form must reproduce the above
  23  *        copyright notice, this list of conditions and the following
  24  *        disclaimer in the documentation and/or other materials
  25  *        provided with the distribution.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  34  * SOFTWARE.
  35  */
  36
  37 #include <linux/module.h>
  38 #include <linux/init.h>
  39 #include <linux/device.h>
  40 #include <linux/err.h>
  41 #include <linux/fs.h>
  42 #include <linux/poll.h>
  43 #include <linux/sched.h>
  44 #include <linux/file.h>
  45 #include <linux/cdev.h>
  46 #include <linux/anon_inodes.h>
  47 #include <linux/slab.h>
  48
  49 #include <linux/uaccess.h>
  50
  51 #include <rdma/ib.h>
  52 #include <rdma/uverbs_std_types.h>
  53
  54 #include "uverbs.h"
  55 #include "core_priv.h"
  56 #include "rdma_core.h"
  57
  58 MODULE_AUTHOR("Roland Dreier");
  59 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
  60 MODULE_LICENSE("Dual BSD/GPL");
  61
  62 enum {
  63         IB_UVERBS_MAJOR       = 231,
  64         IB_UVERBS_BASE_MINOR  = 192,
  65         IB_UVERBS_MAX_DEVICES = RDMA_MAX_PORTS,
  66         IB_UVERBS_NUM_FIXED_MINOR = 32,
  67         IB_UVERBS_NUM_DYNAMIC_MINOR = IB_UVERBS_MAX_DEVICES - IB_UVERBS_NUM_FIXED_MINOR,
  68 };
  69
  70 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
  71
  72 static dev_t dynamic_uverbs_dev;
  73 static struct class *uverbs_class;
  74
  75 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  76
  77 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  78                                      const char __user *buf, int in_len,
  79                                      int out_len) = {
  80         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
  81         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
  82         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
  83         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
  84         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
  85         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
  86         [IB_USER_VERBS_CMD_REREG_MR]            = ib_uverbs_rereg_mr,
  87         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
  88         [IB_USER_VERBS_CMD_ALLOC_MW]            = ib_uverbs_alloc_mw,
  89         [IB_USER_VERBS_CMD_DEALLOC_MW]          = ib_uverbs_dealloc_mw,
  90         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
  91         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
  92         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
  93         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
  94         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
  95         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
  96         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
  97         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
  98         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
  99         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
 100         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
 101         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
 102         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
 103         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
 104         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
 105         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
 106         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
 107         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
 108         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
 109         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
 110         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
 111         [IB_USER_VERBS_CMD_OPEN_XRCD]           = ib_uverbs_open_xrcd,
 112         [IB_USER_VERBS_CMD_CLOSE_XRCD]          = ib_uverbs_close_xrcd,
 113         [IB_USER_VERBS_CMD_CREATE_XSRQ]         = ib_uverbs_create_xsrq,
 114         [IB_USER_VERBS_CMD_OPEN_QP]             = ib_uverbs_open_qp,
 115 };
 116
 117 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
 118                                     struct ib_udata *ucore,
 119                                     struct ib_udata *uhw) = {
 120         [IB_USER_VERBS_EX_CMD_CREATE_FLOW]      = ib_uverbs_ex_create_flow,
 121         [IB_USER_VERBS_EX_CMD_DESTROY_FLOW]     = ib_uverbs_ex_destroy_flow,
 122         [IB_USER_VERBS_EX_CMD_QUERY_DEVICE]     = ib_uverbs_ex_query_device,
 123         [IB_USER_VERBS_EX_CMD_CREATE_CQ]        = ib_uverbs_ex_create_cq,
 124         [IB_USER_VERBS_EX_CMD_CREATE_QP]        = ib_uverbs_ex_create_qp,
 125         [IB_USER_VERBS_EX_CMD_CREATE_WQ]        = ib_uverbs_ex_create_wq,
 126         [IB_USER_VERBS_EX_CMD_MODIFY_WQ]        = ib_uverbs_ex_modify_wq,
 127         [IB_USER_VERBS_EX_CMD_DESTROY_WQ]       = ib_uverbs_ex_destroy_wq,
 128         [IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL] = ib_uverbs_ex_create_rwq_ind_table,
 129         [IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL] = ib_uverbs_ex_destroy_rwq_ind_table,
 130         [IB_USER_VERBS_EX_CMD_MODIFY_QP]        = ib_uverbs_ex_modify_qp,
 131         [IB_USER_VERBS_EX_CMD_MODIFY_CQ]        = ib_uverbs_ex_modify_cq,
 132 };
 133
 134 static void ib_uverbs_add_one(struct ib_device *device);
 135 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
 136
 137 /*
 138  * Must be called with the ufile->device->disassociate_srcu held, and the lock
 139  * must be held until use of the ucontext is finished.
 140  */
 141 struct ib_ucontext *ib_uverbs_get_ucontext(struct ib_uverbs_file *ufile)
 142 {
 143         /*
 144          * We do not hold the hw_destroy_rwsem lock for this flow, instead
 145          * srcu is used. It does not matter if someone races this with
 146          * get_context, we get NULL or valid ucontext.
 147          */
 148         struct ib_ucontext *ucontext = smp_load_acquire(&ufile->ucontext);
 149
 150         if (!srcu_dereference(ufile->device->ib_dev,
 151                               &ufile->device->disassociate_srcu))
 152                 return ERR_PTR(-EIO);
 153
 154         if (!ucontext)
 155                 return ERR_PTR(-EINVAL);
 156
 157         return ucontext;
 158 }
 159 EXPORT_SYMBOL(ib_uverbs_get_ucontext);
 160
 161 int uverbs_dealloc_mw(struct ib_mw *mw)
 162 {
 163         struct ib_pd *pd = mw->pd;
 164         int ret;
 165
 166         ret = mw->device->dealloc_mw(mw);
 167         if (!ret)
 168                 atomic_dec(&pd->usecnt);
 169         return ret;
 170 }
 171
 172 static void ib_uverbs_release_dev(struct kobject *kobj)
 173 {
 174         struct ib_uverbs_device *dev =
 175                 container_of(kobj, struct ib_uverbs_device, kobj);
 176
 177         uverbs_destroy_api(dev->uapi);
 178         cleanup_srcu_struct(&dev->disassociate_srcu);
 179         kfree(dev);
 180 }
 181
 182 static struct kobj_type ib_uverbs_dev_ktype = {
 183         .release = ib_uverbs_release_dev,
 184 };
 185
 186 static void ib_uverbs_release_async_event_file(struct kref *ref)
 187 {
 188         struct ib_uverbs_async_event_file *file =
 189                 container_of(ref, struct ib_uverbs_async_event_file, ref);
 190
 191         kfree(file);
 192 }
 193
 194 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
 195                           struct ib_uverbs_completion_event_file *ev_file,
 196                           struct ib_ucq_object *uobj)
 197 {
 198         struct ib_uverbs_event *evt, *tmp;
 199
 200         if (ev_file) {
 201                 spin_lock_irq(&ev_file->ev_queue.lock);
 202                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 203                         list_del(&evt->list);
 204                         kfree(evt);
 205                 }
 206                 spin_unlock_irq(&ev_file->ev_queue.lock);
 207
 208                 uverbs_uobject_put(&ev_file->uobj);
 209         }
 210
 211         spin_lock_irq(&file->async_file->ev_queue.lock);
 212         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
 213                 list_del(&evt->list);
 214                 kfree(evt);
 215         }
 216         spin_unlock_irq(&file->async_file->ev_queue.lock);
 217 }
 218
 219 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
 220                               struct ib_uevent_object *uobj)
 221 {
 222         struct ib_uverbs_event *evt, *tmp;
 223
 224         spin_lock_irq(&file->async_file->ev_queue.lock);
 225         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 226                 list_del(&evt->list);
 227                 kfree(evt);
 228         }
 229         spin_unlock_irq(&file->async_file->ev_queue.lock);
 230 }
 231
 232 void ib_uverbs_detach_umcast(struct ib_qp *qp,
 233                              struct ib_uqp_object *uobj)
 234 {
 235         struct ib_uverbs_mcast_entry *mcast, *tmp;
 236
 237         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 238                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 239                 list_del(&mcast->list);
 240                 kfree(mcast);
 241         }
 242 }
 243
 244 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
 245 {
 246         complete(&dev->comp);
 247 }
 248
 249 void ib_uverbs_release_file(struct kref *ref)
 250 {
 251         struct ib_uverbs_file *file =
 252                 container_of(ref, struct ib_uverbs_file, ref);
 253         struct ib_device *ib_dev;
 254         int srcu_key;
 255
 256         release_ufile_idr_uobject(file);
 257
 258         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 259         ib_dev = srcu_dereference(file->device->ib_dev,
 260                                   &file->device->disassociate_srcu);
 261         if (ib_dev && !ib_dev->disassociate_ucontext)
 262                 module_put(ib_dev->owner);
 263         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 264
 265         if (atomic_dec_and_test(&file->device->refcount))
 266                 ib_uverbs_comp_dev(file->device);
 267
 268         if (file->async_file)
 269                 kref_put(&file->async_file->ref,
 270                          ib_uverbs_release_async_event_file);
 271         kobject_put(&file->device->kobj);
 272         kfree(file);
 273 }
 274
 275 static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue,
 276                                     struct file *filp, char __user *buf,
 277                                     size_t count, loff_t *pos,
 278                                     size_t eventsz)
 279 {
 280         struct ib_uverbs_event *event;
 281         int ret = 0;
 282
 283         spin_lock_irq(&ev_queue->lock);
 284
 285         while (list_empty(&ev_queue->event_list)) {
 286                 spin_unlock_irq(&ev_queue->lock);
 287
 288                 if (filp->f_flags & O_NONBLOCK)
 289                         return -EAGAIN;
 290
 291                 if (wait_event_interruptible(ev_queue->poll_wait,
 292                                              (!list_empty(&ev_queue->event_list) ||
 293                                               ev_queue->is_closed)))
 294                         return -ERESTARTSYS;
 295
 296                 spin_lock_irq(&ev_queue->lock);
 297
 298                 /* If device was disassociated and no event exists set an error */
 299                 if (list_empty(&ev_queue->event_list) && ev_queue->is_closed) {
 300                         spin_unlock_irq(&ev_queue->lock);
 301                         return -EIO;
 302                 }
 303         }
 304
 305         event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list);
 306
 307         if (eventsz > count) {
 308                 ret   = -EINVAL;
 309                 event = NULL;
 310         } else {
 311                 list_del(ev_queue->event_list.next);
 312                 if (event->counter) {
 313                         ++(*event->counter);
 314                         list_del(&event->obj_list);
 315                 }
 316         }
 317
 318         spin_unlock_irq(&ev_queue->lock);
 319
 320         if (event) {
 321                 if (copy_to_user(buf, event, eventsz))
 322                         ret = -EFAULT;
 323                 else
 324                         ret = eventsz;
 325         }
 326
 327         kfree(event);
 328
 329         return ret;
 330 }
 331
 332 static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf,
 333                                           size_t count, loff_t *pos)
 334 {
 335         struct ib_uverbs_async_event_file *file = filp->private_data;
 336
 337         return ib_uverbs_event_read(&file->ev_queue, filp, buf, count, pos,
 338                                     sizeof(struct ib_uverbs_async_event_desc));
 339 }
 340
 341 static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf,
 342                                          size_t count, loff_t *pos)
 343 {
 344         struct ib_uverbs_completion_event_file *comp_ev_file =
 345                 filp->private_data;
 346
 347         return ib_uverbs_event_read(&comp_ev_file->ev_queue, filp, buf, count,
 348                                     pos,
 349                                     sizeof(struct ib_uverbs_comp_event_desc));
 350 }
 351
 352 static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue,
 353                                          struct file *filp,
 354                                          struct poll_table_struct *wait)
 355 {
 356         __poll_t pollflags = 0;
 357
 358         poll_wait(filp, &ev_queue->poll_wait, wait);
 359
 360         spin_lock_irq(&ev_queue->lock);
 361         if (!list_empty(&ev_queue->event_list))
 362                 pollflags = EPOLLIN | EPOLLRDNORM;
 363         else if (ev_queue->is_closed)
 364                 pollflags = EPOLLERR;
 365         spin_unlock_irq(&ev_queue->lock);
 366
 367         return pollflags;
 368 }
 369
 370 static __poll_t ib_uverbs_async_event_poll(struct file *filp,
 371                                                struct poll_table_struct *wait)
 372 {
 373         struct ib_uverbs_async_event_file *file = filp->private_data;
 374
 375         return ib_uverbs_event_poll(&file->ev_queue, filp, wait);
 376 }
 377
 378 static __poll_t ib_uverbs_comp_event_poll(struct file *filp,
 379                                               struct poll_table_struct *wait)
 380 {
 381         struct ib_uverbs_completion_event_file *comp_ev_file =
 382                 filp->private_data;
 383
 384         return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait);
 385 }
 386
 387 static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on)
 388 {
 389         struct ib_uverbs_async_event_file *file = filp->private_data;
 390
 391         return fasync_helper(fd, filp, on, &file->ev_queue.async_queue);
 392 }
 393
 394 static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on)
 395 {
 396         struct ib_uverbs_completion_event_file *comp_ev_file =
 397                 filp->private_data;
 398
 399         return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue);
 400 }
 401
 402 static int ib_uverbs_async_event_close(struct inode *inode, struct file *filp)
 403 {
 404         struct ib_uverbs_async_event_file *file = filp->private_data;
 405         struct ib_uverbs_file *uverbs_file = file->uverbs_file;
 406         struct ib_uverbs_event *entry, *tmp;
 407         int closed_already = 0;
 408
 409         mutex_lock(&uverbs_file->device->lists_mutex);
 410         spin_lock_irq(&file->ev_queue.lock);
 411         closed_already = file->ev_queue.is_closed;
 412         file->ev_queue.is_closed = 1;
 413         list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
 414                 if (entry->counter)
 415                         list_del(&entry->obj_list);
 416                 kfree(entry);
 417         }
 418         spin_unlock_irq(&file->ev_queue.lock);
 419         if (!closed_already) {
 420                 list_del(&file->list);
 421                 ib_unregister_event_handler(&uverbs_file->event_handler);
 422         }
 423         mutex_unlock(&uverbs_file->device->lists_mutex);
 424
 425         kref_put(&uverbs_file->ref, ib_uverbs_release_file);
 426         kref_put(&file->ref, ib_uverbs_release_async_event_file);
 427
 428         return 0;
 429 }
 430
 431 static int ib_uverbs_comp_event_close(struct inode *inode, struct file *filp)
 432 {
 433         struct ib_uobject *uobj = filp->private_data;
 434         struct ib_uverbs_completion_event_file *file = container_of(
 435                 uobj, struct ib_uverbs_completion_event_file, uobj);
 436         struct ib_uverbs_event *entry, *tmp;
 437
 438         spin_lock_irq(&file->ev_queue.lock);
 439         list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
 440                 if (entry->counter)
 441                         list_del(&entry->obj_list);
 442                 kfree(entry);
 443         }
 444         file->ev_queue.is_closed = 1;
 445         spin_unlock_irq(&file->ev_queue.lock);
 446
 447         uverbs_close_fd(filp);
 448
 449         return 0;
 450 }
 451
 452 const struct file_operations uverbs_event_fops = {
 453         .owner   = THIS_MODULE,
 454         .read    = ib_uverbs_comp_event_read,
 455         .poll    = ib_uverbs_comp_event_poll,
 456         .release = ib_uverbs_comp_event_close,
 457         .fasync  = ib_uverbs_comp_event_fasync,
 458         .llseek  = no_llseek,
 459 };
 460
 461 static const struct file_operations uverbs_async_event_fops = {
 462         .owner   = THIS_MODULE,
 463         .read    = ib_uverbs_async_event_read,
 464         .poll    = ib_uverbs_async_event_poll,
 465         .release = ib_uverbs_async_event_close,
 466         .fasync  = ib_uverbs_async_event_fasync,
 467         .llseek  = no_llseek,
 468 };
 469
 470 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 471 {
 472         struct ib_uverbs_event_queue   *ev_queue = cq_context;
 473         struct ib_ucq_object           *uobj;
 474         struct ib_uverbs_event         *entry;
 475         unsigned long                   flags;
 476
 477         if (!ev_queue)
 478                 return;
 479
 480         spin_lock_irqsave(&ev_queue->lock, flags);
 481         if (ev_queue->is_closed) {
 482                 spin_unlock_irqrestore(&ev_queue->lock, flags);
 483                 return;
 484         }
 485
 486         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
 487         if (!entry) {
 488                 spin_unlock_irqrestore(&ev_queue->lock, flags);
 489                 return;
 490         }
 491
 492         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 493
 494         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 495         entry->counter             = &uobj->comp_events_reported;
 496
 497         list_add_tail(&entry->list, &ev_queue->event_list);
 498         list_add_tail(&entry->obj_list, &uobj->comp_list);
 499         spin_unlock_irqrestore(&ev_queue->lock, flags);
 500
 501         wake_up_interruptible(&ev_queue->poll_wait);
 502         kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN);
 503 }
 504
 505 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 506                                     __u64 element, __u64 event,
 507                                     struct list_head *obj_list,
 508                                     u32 *counter)
 509 {
 510         struct ib_uverbs_event *entry;
 511         unsigned long flags;
 512
 513         spin_lock_irqsave(&file->async_file->ev_queue.lock, flags);
 514         if (file->async_file->ev_queue.is_closed) {
 515                 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
 516                 return;
 517         }
 518
 519         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
 520         if (!entry) {
 521                 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
 522                 return;
 523         }
 524
 525         entry->desc.async.element    = element;
 526         entry->desc.async.event_type = event;
 527         entry->desc.async.reserved   = 0;
 528         entry->counter               = counter;
 529
 530         list_add_tail(&entry->list, &file->async_file->ev_queue.event_list);
 531         if (obj_list)
 532                 list_add_tail(&entry->obj_list, obj_list);
 533         spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
 534
 535         wake_up_interruptible(&file->async_file->ev_queue.poll_wait);
 536         kill_fasync(&file->async_file->ev_queue.async_queue, SIGIO, POLL_IN);
 537 }
 538
 539 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 540 {
 541         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 542                                                   struct ib_ucq_object, uobject);
 543
 544         ib_uverbs_async_handler(uobj->uobject.ufile, uobj->uobject.user_handle,
 545                                 event->event, &uobj->async_list,
 546                                 &uobj->async_events_reported);
 547 }
 548
 549 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 550 {
 551         struct ib_uevent_object *uobj;
 552
 553         /* for XRC target qp's, check that qp is live */
 554         if (!event->element.qp->uobject)
 555                 return;
 556
 557         uobj = container_of(event->element.qp->uobject,
 558                             struct ib_uevent_object, uobject);
 559
 560         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 561                                 event->event, &uobj->event_list,
 562                                 &uobj->events_reported);
 563 }
 564
 565 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr)
 566 {
 567         struct ib_uevent_object *uobj = container_of(event->element.wq->uobject,
 568                                                   struct ib_uevent_object, uobject);
 569
 570         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 571                                 event->event, &uobj->event_list,
 572                                 &uobj->events_reported);
 573 }
 574
 575 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 576 {
 577         struct ib_uevent_object *uobj;
 578
 579         uobj = container_of(event->element.srq->uobject,
 580                             struct ib_uevent_object, uobject);
 581
 582         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 583                                 event->event, &uobj->event_list,
 584                                 &uobj->events_reported);
 585 }
 586
 587 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 588                              struct ib_event *event)
 589 {
 590         struct ib_uverbs_file *file =
 591                 container_of(handler, struct ib_uverbs_file, event_handler);
 592
 593         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 594                                 NULL, NULL);
 595 }
 596
 597 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
 598 {
 599         kref_put(&file->async_file->ref, ib_uverbs_release_async_event_file);
 600         file->async_file = NULL;
 601 }
 602
 603 void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue)
 604 {
 605         spin_lock_init(&ev_queue->lock);
 606         INIT_LIST_HEAD(&ev_queue->event_list);
 607         init_waitqueue_head(&ev_queue->poll_wait);
 608         ev_queue->is_closed   = 0;
 609         ev_queue->async_queue = NULL;
 610 }
 611
 612 struct file *ib_uverbs_alloc_async_event_file(struct ib_uverbs_file *uverbs_file,
 613                                               struct ib_device  *ib_dev)
 614 {
 615         struct ib_uverbs_async_event_file *ev_file;
 616         struct file *filp;
 617
 618         ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
 619         if (!ev_file)
 620                 return ERR_PTR(-ENOMEM);
 621
 622         ib_uverbs_init_event_queue(&ev_file->ev_queue);
 623         ev_file->uverbs_file = uverbs_file;
 624         kref_get(&ev_file->uverbs_file->ref);
 625         kref_init(&ev_file->ref);
 626         filp = anon_inode_getfile("[infinibandevent]", &uverbs_async_event_fops,
 627                                   ev_file, O_RDONLY);
 628         if (IS_ERR(filp))
 629                 goto err_put_refs;
 630
 631         mutex_lock(&uverbs_file->device->lists_mutex);
 632         list_add_tail(&ev_file->list,
 633                       &uverbs_file->device->uverbs_events_file_list);
 634         mutex_unlock(&uverbs_file->device->lists_mutex);
 635
 636         WARN_ON(uverbs_file->async_file);
 637         uverbs_file->async_file = ev_file;
 638         kref_get(&uverbs_file->async_file->ref);
 639         INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
 640                               ib_dev,
 641                               ib_uverbs_event_handler);
 642         ib_register_event_handler(&uverbs_file->event_handler);
 643         /* At that point async file stuff was fully set */
 644
 645         return filp;
 646
 647 err_put_refs:
 648         kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
 649         kref_put(&ev_file->ref, ib_uverbs_release_async_event_file);
 650         return filp;
 651 }
 652
 653 static bool verify_command_mask(struct ib_uverbs_file *ufile, u32 command,
 654                                 bool extended)
 655 {
 656         if (!extended)
 657                 return ufile->uverbs_cmd_mask & BIT_ULL(command);
 658
 659         return ufile->uverbs_ex_cmd_mask & BIT_ULL(command);
 660 }
 661
 662 static bool verify_command_idx(u32 command, bool extended)
 663 {
 664         if (extended)
 665                 return command < ARRAY_SIZE(uverbs_ex_cmd_table) &&
 666                        uverbs_ex_cmd_table[command];
 667
 668         return command < ARRAY_SIZE(uverbs_cmd_table) &&
 669                uverbs_cmd_table[command];
 670 }
 671
 672 static ssize_t process_hdr(struct ib_uverbs_cmd_hdr *hdr,
 673                            u32 *command, bool *extended)
 674 {
 675         if (hdr->command & ~(u32)(IB_USER_VERBS_CMD_FLAG_EXTENDED |
 676                                    IB_USER_VERBS_CMD_COMMAND_MASK))
 677                 return -EINVAL;
 678
 679         *command = hdr->command & IB_USER_VERBS_CMD_COMMAND_MASK;
 680         *extended = hdr->command & IB_USER_VERBS_CMD_FLAG_EXTENDED;
 681
 682         if (!verify_command_idx(*command, *extended))
 683                 return -EOPNOTSUPP;
 684
 685         return 0;
 686 }
 687
 688 static ssize_t verify_hdr(struct ib_uverbs_cmd_hdr *hdr,
 689                           struct ib_uverbs_ex_cmd_hdr *ex_hdr,
 690                           size_t count, bool extended)
 691 {
 692         if (extended) {
 693                 count -= sizeof(*hdr) + sizeof(*ex_hdr);
 694
 695                 if ((hdr->in_words + ex_hdr->provider_in_words) * 8 != count)
 696                         return -EINVAL;
 697
 698                 if (ex_hdr->cmd_hdr_reserved)
 699                         return -EINVAL;
 700
 701                 if (ex_hdr->response) {
 702                         if (!hdr->out_words && !ex_hdr->provider_out_words)
 703                                 return -EINVAL;
 704
 705                         if (!access_ok(VERIFY_WRITE,
 706                                        u64_to_user_ptr(ex_hdr->response),
 707                                        (hdr->out_words + ex_hdr->provider_out_words) * 8))
 708                                 return -EFAULT;
 709                 } else {
 710                         if (hdr->out_words || ex_hdr->provider_out_words)
 711                                 return -EINVAL;
 712                 }
 713
 714                 return 0;
 715         }
 716
 717         /* not extended command */
 718         if (hdr->in_words * 4 != count)
 719                 return -EINVAL;
 720
 721         return 0;
 722 }
 723
 724 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 725                              size_t count, loff_t *pos)
 726 {
 727         struct ib_uverbs_file *file = filp->private_data;
 728         struct ib_uverbs_ex_cmd_hdr ex_hdr;
 729         struct ib_uverbs_cmd_hdr hdr;
 730         bool extended;
 731         int srcu_key;
 732         u32 command;
 733         ssize_t ret;
 734
 735         if (!ib_safe_file_access(filp)) {
 736                 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
 737                             task_tgid_vnr(current), current->comm);
 738                 return -EACCES;
 739         }
 740
 741         if (count < sizeof(hdr))
 742                 return -EINVAL;
 743
 744         if (copy_from_user(&hdr, buf, sizeof(hdr)))
 745                 return -EFAULT;
 746
 747         ret = process_hdr(&hdr, &command, &extended);
 748         if (ret)
 749                 return ret;
 750
 751         if (extended) {
 752                 if (count < (sizeof(hdr) + sizeof(ex_hdr)))
 753                         return -EINVAL;
 754                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr)))
 755                         return -EFAULT;
 756         }
 757
 758         ret = verify_hdr(&hdr, &ex_hdr, count, extended);
 759         if (ret)
 760                 return ret;
 761
 762         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 763
 764         if (!verify_command_mask(file, command, extended)) {
 765                 ret = -EOPNOTSUPP;
 766                 goto out;
 767         }
 768
 769         buf += sizeof(hdr);
 770
 771         if (!extended) {
 772                 ret = uverbs_cmd_table[command](file, buf,
 773                                                 hdr.in_words * 4,
 774                                                 hdr.out_words * 4);
 775         } else {
 776                 struct ib_udata ucore;
 777                 struct ib_udata uhw;
 778
 779                 buf += sizeof(ex_hdr);
 780
 781                 ib_uverbs_init_udata_buf_or_null(&ucore, buf,
 782                                         u64_to_user_ptr(ex_hdr.response),
 783                                         hdr.in_words * 8, hdr.out_words * 8);
 784
 785                 ib_uverbs_init_udata_buf_or_null(&uhw,
 786                                         buf + ucore.inlen,
 787                                         u64_to_user_ptr(ex_hdr.response) + ucore.outlen,
 788                                         ex_hdr.provider_in_words * 8,
 789                                         ex_hdr.provider_out_words * 8);
 790
 791                 ret = uverbs_ex_cmd_table[command](file, &ucore, &uhw);
 792                 ret = (ret) ? : count;
 793         }
 794
 795 out:
 796         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 797         return ret;
 798 }
 799
 800 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 801 {
 802         struct ib_uverbs_file *file = filp->private_data;
 803         struct ib_ucontext *ucontext;
 804         int ret = 0;
 805         int srcu_key;
 806
 807         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 808         ucontext = ib_uverbs_get_ucontext(file);
 809         if (IS_ERR(ucontext)) {
 810                 ret = PTR_ERR(ucontext);
 811                 goto out;
 812         }
 813
 814         ret = ucontext->device->mmap(ucontext, vma);
 815 out:
 816         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 817         return ret;
 818 }
 819
 820 /*
 821  * ib_uverbs_open() does not need the BKL:
 822  *
 823  *  - the ib_uverbs_device structures are properly reference counted and
 824  *    everything else is purely local to the file being created, so
 825  *    races against other open calls are not a problem;
 826  *  - there is no ioctl method to race against;
 827  *  - the open method will either immediately run -ENXIO, or all
 828  *    required initialization will be done.
 829  */
 830 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 831 {
 832         struct ib_uverbs_device *dev;
 833         struct ib_uverbs_file *file;
 834         struct ib_device *ib_dev;
 835         int ret;
 836         int module_dependent;
 837         int srcu_key;
 838
 839         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 840         if (!atomic_inc_not_zero(&dev->refcount))
 841                 return -ENXIO;
 842
 843         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 844         mutex_lock(&dev->lists_mutex);
 845         ib_dev = srcu_dereference(dev->ib_dev,
 846                                   &dev->disassociate_srcu);
 847         if (!ib_dev) {
 848                 ret = -EIO;
 849                 goto err;
 850         }
 851
 852         /* In case IB device supports disassociate ucontext, there is no hard
 853          * dependency between uverbs device and its low level device.
 854          */
 855         module_dependent = !(ib_dev->disassociate_ucontext);
 856
 857         if (module_dependent) {
 858                 if (!try_module_get(ib_dev->owner)) {
 859                         ret = -ENODEV;
 860                         goto err;
 861                 }
 862         }
 863
 864         file = kzalloc(sizeof(*file), GFP_KERNEL);
 865         if (!file) {
 866                 ret = -ENOMEM;
 867                 if (module_dependent)
 868                         goto err_module;
 869
 870                 goto err;
 871         }
 872
 873         file->device     = dev;
 874         kref_init(&file->ref);
 875         mutex_init(&file->ucontext_lock);
 876
 877         spin_lock_init(&file->uobjects_lock);
 878         INIT_LIST_HEAD(&file->uobjects);
 879         init_rwsem(&file->hw_destroy_rwsem);
 880
 881         filp->private_data = file;
 882         kobject_get(&dev->kobj);
 883         list_add_tail(&file->list, &dev->uverbs_file_list);
 884         mutex_unlock(&dev->lists_mutex);
 885         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 886
 887         file->uverbs_cmd_mask = ib_dev->uverbs_cmd_mask;
 888         file->uverbs_ex_cmd_mask = ib_dev->uverbs_ex_cmd_mask;
 889
 890         setup_ufile_idr_uobject(file);
 891
 892         return nonseekable_open(inode, filp);
 893
 894 err_module:
 895         module_put(ib_dev->owner);
 896
 897 err:
 898         mutex_unlock(&dev->lists_mutex);
 899         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 900         if (atomic_dec_and_test(&dev->refcount))
 901                 ib_uverbs_comp_dev(dev);
 902
 903         return ret;
 904 }
 905
 906 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 907 {
 908         struct ib_uverbs_file *file = filp->private_data;
 909
 910         uverbs_destroy_ufile_hw(file, RDMA_REMOVE_CLOSE);
 911
 912         mutex_lock(&file->device->lists_mutex);
 913         if (!file->is_closed) {
 914                 list_del(&file->list);
 915                 file->is_closed = 1;
 916         }
 917         mutex_unlock(&file->device->lists_mutex);
 918
 919         kref_put(&file->ref, ib_uverbs_release_file);
 920
 921         return 0;
 922 }
 923
 924 static const struct file_operations uverbs_fops = {
 925         .owner   = THIS_MODULE,
 926         .write   = ib_uverbs_write,
 927         .open    = ib_uverbs_open,
 928         .release = ib_uverbs_close,
 929         .llseek  = no_llseek,
 930         .unlocked_ioctl = ib_uverbs_ioctl,
 931         .compat_ioctl = ib_uverbs_ioctl,
 932 };
 933
 934 static const struct file_operations uverbs_mmap_fops = {
 935         .owner   = THIS_MODULE,
 936         .write   = ib_uverbs_write,
 937         .mmap    = ib_uverbs_mmap,
 938         .open    = ib_uverbs_open,
 939         .release = ib_uverbs_close,
 940         .llseek  = no_llseek,
 941         .unlocked_ioctl = ib_uverbs_ioctl,
 942         .compat_ioctl = ib_uverbs_ioctl,
 943 };
 944
 945 static struct ib_client uverbs_client = {
 946         .name   = "uverbs",
 947         .add    = ib_uverbs_add_one,
 948         .remove = ib_uverbs_remove_one
 949 };
 950
 951 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
 952                           char *buf)
 953 {
 954         int ret = -ENODEV;
 955         int srcu_key;
 956         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 957         struct ib_device *ib_dev;
 958
 959         if (!dev)
 960                 return -ENODEV;
 961
 962         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 963         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
 964         if (ib_dev)
 965                 ret = sprintf(buf, "%s\n", ib_dev->name);
 966         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 967
 968         return ret;
 969 }
 970 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 971
 972 static ssize_t show_dev_abi_version(struct device *device,
 973                                     struct device_attribute *attr, char *buf)
 974 {
 975         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 976         int ret = -ENODEV;
 977         int srcu_key;
 978         struct ib_device *ib_dev;
 979
 980         if (!dev)
 981                 return -ENODEV;
 982         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 983         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
 984         if (ib_dev)
 985                 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
 986         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 987
 988         return ret;
 989 }
 990 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
 991
 992 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
 993                          __stringify(IB_USER_VERBS_ABI_VERSION));
 994
 995 static int ib_uverbs_create_uapi(struct ib_device *device,
 996                                  struct ib_uverbs_device *uverbs_dev)
 997 {
 998         struct uverbs_api *uapi;
 999
1000         uapi = uverbs_alloc_api(device->driver_specs, device->driver_id);
1001         if (IS_ERR(uapi))
1002                 return PTR_ERR(uapi);
1003
1004         uverbs_dev->uapi = uapi;
1005         return 0;
1006 }
1007
1008 static void ib_uverbs_add_one(struct ib_device *device)
1009 {
1010         int devnum;
1011         dev_t base;
1012         struct ib_uverbs_device *uverbs_dev;
1013         int ret;
1014
1015         if (!device->alloc_ucontext)
1016                 return;
1017
1018         uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL);
1019         if (!uverbs_dev)
1020                 return;
1021
1022         ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1023         if (ret) {
1024                 kfree(uverbs_dev);
1025                 return;
1026         }
1027
1028         atomic_set(&uverbs_dev->refcount, 1);
1029         init_completion(&uverbs_dev->comp);
1030         uverbs_dev->xrcd_tree = RB_ROOT;
1031         mutex_init(&uverbs_dev->xrcd_tree_mutex);
1032         kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1033         mutex_init(&uverbs_dev->lists_mutex);
1034         INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1035         INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1036
1037         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1038         if (devnum >= IB_UVERBS_MAX_DEVICES)
1039                 goto err;
1040         uverbs_dev->devnum = devnum;
1041         set_bit(devnum, dev_map);
1042         if (devnum >= IB_UVERBS_NUM_FIXED_MINOR)
1043                 base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR;
1044         else
1045                 base = IB_UVERBS_BASE_DEV + devnum;
1046
1047         rcu_assign_pointer(uverbs_dev->ib_dev, device);
1048         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1049
1050         if (ib_uverbs_create_uapi(device, uverbs_dev))
1051                 goto err_uapi;
1052
1053         cdev_init(&uverbs_dev->cdev, NULL);
1054         uverbs_dev->cdev.owner = THIS_MODULE;
1055         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1056         cdev_set_parent(&uverbs_dev->cdev, &uverbs_dev->kobj);
1057         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1058         if (cdev_add(&uverbs_dev->cdev, base, 1))
1059                 goto err_cdev;
1060
1061         uverbs_dev->dev = device_create(uverbs_class, device->dev.parent,
1062                                         uverbs_dev->cdev.dev, uverbs_dev,
1063                                         "uverbs%d", uverbs_dev->devnum);
1064         if (IS_ERR(uverbs_dev->dev))
1065                 goto err_cdev;
1066
1067         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1068                 goto err_class;
1069         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1070                 goto err_class;
1071
1072         ib_set_client_data(device, &uverbs_client, uverbs_dev);
1073
1074         return;
1075
1076 err_class:
1077         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1078 err_cdev:
1079         cdev_del(&uverbs_dev->cdev);
1080 err_uapi:
1081         clear_bit(devnum, dev_map);
1082 err:
1083         if (atomic_dec_and_test(&uverbs_dev->refcount))
1084                 ib_uverbs_comp_dev(uverbs_dev);
1085         wait_for_completion(&uverbs_dev->comp);
1086         kobject_put(&uverbs_dev->kobj);
1087         return;
1088 }
1089
1090 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1091                                         struct ib_device *ib_dev)
1092 {
1093         struct ib_uverbs_file *file;
1094         struct ib_uverbs_async_event_file *event_file;
1095         struct ib_event event;
1096
1097         /* Pending running commands to terminate */
1098         uverbs_disassociate_api_pre(uverbs_dev);
1099         event.event = IB_EVENT_DEVICE_FATAL;
1100         event.element.port_num = 0;
1101         event.device = ib_dev;
1102
1103         mutex_lock(&uverbs_dev->lists_mutex);
1104         while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1105                 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1106                                         struct ib_uverbs_file, list);
1107                 file->is_closed = 1;
1108                 list_del(&file->list);
1109                 kref_get(&file->ref);
1110
1111                 /* We must release the mutex before going ahead and calling
1112                  * uverbs_cleanup_ufile, as it might end up indirectly calling
1113                  * uverbs_close, for example due to freeing the resources (e.g
1114                  * mmput).
1115                  */
1116                 mutex_unlock(&uverbs_dev->lists_mutex);
1117
1118                 ib_uverbs_event_handler(&file->event_handler, &event);
1119                 uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE);
1120                 kref_put(&file->ref, ib_uverbs_release_file);
1121
1122                 mutex_lock(&uverbs_dev->lists_mutex);
1123         }
1124
1125         while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1126                 event_file = list_first_entry(&uverbs_dev->
1127                                               uverbs_events_file_list,
1128                                               struct ib_uverbs_async_event_file,
1129                                               list);
1130                 spin_lock_irq(&event_file->ev_queue.lock);
1131                 event_file->ev_queue.is_closed = 1;
1132                 spin_unlock_irq(&event_file->ev_queue.lock);
1133
1134                 list_del(&event_file->list);
1135                 ib_unregister_event_handler(
1136                         &event_file->uverbs_file->event_handler);
1137                 event_file->uverbs_file->event_handler.device =
1138                         NULL;
1139
1140                 wake_up_interruptible(&event_file->ev_queue.poll_wait);
1141                 kill_fasync(&event_file->ev_queue.async_queue, SIGIO, POLL_IN);
1142         }
1143         mutex_unlock(&uverbs_dev->lists_mutex);
1144
1145         uverbs_disassociate_api(uverbs_dev->uapi);
1146 }
1147
1148 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1149 {
1150         struct ib_uverbs_device *uverbs_dev = client_data;
1151         int wait_clients = 1;
1152
1153         if (!uverbs_dev)
1154                 return;
1155
1156         dev_set_drvdata(uverbs_dev->dev, NULL);
1157         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1158         cdev_del(&uverbs_dev->cdev);
1159         clear_bit(uverbs_dev->devnum, dev_map);
1160
1161         if (device->disassociate_ucontext) {
1162                 /* We disassociate HW resources and immediately return.
1163                  * Userspace will see a EIO errno for all future access.
1164                  * Upon returning, ib_device may be freed internally and is not
1165                  * valid any more.
1166                  * uverbs_device is still available until all clients close
1167                  * their files, then the uverbs device ref count will be zero
1168                  * and its resources will be freed.
1169                  * Note: At this point no more files can be opened since the
1170                  * cdev was deleted, however active clients can still issue
1171                  * commands and close their open files.
1172                  */
1173                 ib_uverbs_free_hw_resources(uverbs_dev, device);
1174                 wait_clients = 0;
1175         }
1176
1177         if (atomic_dec_and_test(&uverbs_dev->refcount))
1178                 ib_uverbs_comp_dev(uverbs_dev);
1179         if (wait_clients)
1180                 wait_for_completion(&uverbs_dev->comp);
1181
1182         kobject_put(&uverbs_dev->kobj);
1183 }
1184
1185 static char *uverbs_devnode(struct device *dev, umode_t *mode)
1186 {
1187         if (mode)
1188                 *mode = 0666;
1189         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1190 }
1191
1192 static int __init ib_uverbs_init(void)
1193 {
1194         int ret;
1195
1196         ret = register_chrdev_region(IB_UVERBS_BASE_DEV,
1197                                      IB_UVERBS_NUM_FIXED_MINOR,
1198                                      "infiniband_verbs");
1199         if (ret) {
1200                 pr_err("user_verbs: couldn't register device number\n");
1201                 goto out;
1202         }
1203
1204         ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0,
1205                                   IB_UVERBS_NUM_DYNAMIC_MINOR,
1206                                   "infiniband_verbs");
1207         if (ret) {
1208                 pr_err("couldn't register dynamic device number\n");
1209                 goto out_alloc;
1210         }
1211
1212         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1213         if (IS_ERR(uverbs_class)) {
1214                 ret = PTR_ERR(uverbs_class);
1215                 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1216                 goto out_chrdev;
1217         }
1218
1219         uverbs_class->devnode = uverbs_devnode;
1220
1221         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1222         if (ret) {
1223                 pr_err("user_verbs: couldn't create abi_version attribute\n");
1224                 goto out_class;
1225         }
1226
1227         ret = ib_register_client(&uverbs_client);
1228         if (ret) {
1229                 pr_err("user_verbs: couldn't register client\n");
1230                 goto out_class;
1231         }
1232
1233         return 0;
1234
1235 out_class:
1236         class_destroy(uverbs_class);
1237
1238 out_chrdev:
1239         unregister_chrdev_region(dynamic_uverbs_dev,
1240                                  IB_UVERBS_NUM_DYNAMIC_MINOR);
1241
1242 out_alloc:
1243         unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1244                                  IB_UVERBS_NUM_FIXED_MINOR);
1245
1246 out:
1247         return ret;
1248 }
1249
1250 static void __exit ib_uverbs_cleanup(void)
1251 {
1252         ib_unregister_client(&uverbs_client);
1253         class_destroy(uverbs_class);
1254         unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1255                                  IB_UVERBS_NUM_FIXED_MINOR);
1256         unregister_chrdev_region(dynamic_uverbs_dev,
1257                                  IB_UVERBS_NUM_DYNAMIC_MINOR);
1258 }
1259
1260 module_init(ib_uverbs_init);
1261 module_exit(ib_uverbs_cleanup);